Peter has twice as many stickers as Joe. Joe has 40 more stickers than Emily. They have 300 Stickers altogether. How many stickers does Peter have?

170

Step-by-step explanation:

Equations derived from given info.

P=2J J=E+40 P+J+E=300

Use some substitution now.

P=2 (E+40) J=E+40 P+J+E=300

Substitute first and second equation into third.

2 (E+40) + E+40+E=300 2E+80+E+40+E=300 4E+120=300 4E=180 E=45

Emily has 45 stickers. But we want to know what Peter has.

Use P=2 (E+40)

P=2 (45+40) P=90+80 P=170

Peter has 170 stickers.